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Stretchable, compressible, and conductive hydrogel for sensitive wearable soft sensors

JOURNAL OF COLLOID AND INTERFACE SCIENCE 2022年 618卷 111-120页

作者： Peng, xuwen Wang, Wenda Yang, Wenshuai Chen, Jingsi Peng, Qiongyao Wang, Tao Yang, Diling Wang, Jianmei zhang, Hao Zeng, Hongbo Univ Alberta Dept Chem & Mat Engn Edmonton AB T6G 1H9 Canada Taiyuan Univ Sci & Technol Heavy Machinery Engn Res Ctr Educ Minist Taiyuan 030024 Peoples R China

Conductive hydrogels hold great promises in wearable soft electronics. However, the weak mechanical properties, low sensitivity and the absence of multifunctionalities (e.g., self-healing, self-adhesive, etc.) of the conventional conductive hydrogels limit their applications. Thus, developing multifunctional hydrogels may address some of these technical issues. In this work, a multifunctional conductive hydro gel strain sensor is fabricated by incorporating a conductive polymer Poly(3,4-ethylenedioxythiophene)poly(styrenesulfonate) (PEDOT: PSS) into a mechanically robust poly (vinyl alcohol) (PVA)/ poly (acrylic acid) (PAA) double network (DN) hydrogel. The as-prepared hydrogel sensor could span a wide spectrum of mechanical properties by simply tuning the polymer composition and the number of freezing-thawing cycles. In addition, the dynamic hydrogen bonding interactions endow the hydrogel sensor with self healing property and reversible adhesiveness on diverse substrates. Moreover, the hydrogel sensor shows high sensitivity (Gauge Factor from 2.21 to 3.82) and can precisely detect some subtle human motions (e.g., pulse and vocal cord vibration). This work provides useful insights into the development of conductive hydrogel-based wearable soft electronics.(c) 2022 Elsevier Inc. All rights reserved.

关键词： Conductive hydrogel Interfacial interaction Self-healing Soft hydrogel sensors

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Characteristics and mechanism of adsorption of tartaric acid by carbide slag ascertained and applied to prepare a binder

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JOURNAL OF CLEANER PRODUCTION 2022年 337卷

作者： Qin, Yihe zhang, Kai He, xuwen China Univ Min & Technol Beijing Peoples R China

Pelletization is essential for the reutilization of mineral fines, and binder plays a crucial role in preparing pellets that satisfy strength requirements. In this study, carbide slag (CS) was modified with tartaric acid (TA) using a novel binder (TACS) to produce red mud pellets. In this study, to investigate the effect of TACS on the compressive strength of the pellets and ascertain the mechanism of adsorption of TA onto CS during pelletizing and adsorption experiments, the changes in crystal structure, functional groups, and valence states of elements in a solution of CS in TA were analyzed, and density functional theory calculations and molecular dynamics simulations were performed. The target pellet strength was achieved by using TACS to prepare cold-pressed red mud pellets at a solid-to-liquid ratio of 0.20. The pH of the TA solution used to prepare the binder was 13.00. The maximum adsorption capacity of CS for TA, calculated using the Langmuir model, was 336.33 mg.g(-1). The TACS was analyzed using X-ray powder diffraction, Fourier-transform infrared spectroscopy, Brunauer-Emmett-Teller method, and X-ray photoelectron spectroscopy. The analysis results confirmed that the TACS mainly comprised Ca(OH)(2) and that the adsorption of TA onto CS involved complexation and hydrogen bonding. The complexing reactions of the carboxyl and hydroxyl groups of TA with the Ca ion were dominant. This study provides experimental and theoretical guidance for future studies on the preparation of composite binders.

关键词： Tartaric acid Carbide slag Adsorption Binder Density functional theory calculation Molecular dynamics simulation

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Rebar-free concrete construction: Concept, opportunities and challenges

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JOURNAL OF BUILDING ENGINEERING 2024年 86卷

作者： Xiao, Jianzhuang Liu, Haoran Ding, Tao Yu, Kequan zhang, Lihai Xiao, xuwen Zhu, Hehua Guangxi Univ Coll Civil & Architectural Engn Nanning 530004 Peoples R China Guangxi Univ Inst Sci & Technol Carbon Peak & Neutral Nanning 530004 Peoples R China Tongji Univ Coll Civil Engn Shanghai 200092 Peoples R China Univ Melbourne Dept Infrastructure Engn Melbourne Vic 3010 Australia Chinese Acad Engn Beijing 100088 Peoples R China

To tackle the challenges associated with traditional reinforced concrete structures, such as laborintensive construction and durability deterioration over time, this paper proposes an innovative concept called rebar-free concrete construction (RFCC) and explores its potential for future development. Three key aspects of RFCC, including materials, structures, and construction technologies, are comprehensively investigated in this study. It reveals that fiber-reinforced concrete is a promising material for RFCC as it addresses challenges related to load-carrying capacity, ductility, and compatibility with construction technologies, and reduces labor and enables construction in extreme conditions, such as lunar construction. In addition, it shows that bio-inspired structures and optimized designs can significantly contribute to RFCC through offering a balance between architectural aesthetics, load capacity, ductility, and construction efficiency. Furthermore, the paper proposes a design path for RFCC and presents its development prospects. In summary, this paper provides a comprehensive understanding of the innovative concept of RFCC and its potential for future developments. By exploring these aspects of RFCC, researchers and engineers can work towards developing sustainable and resilient construction solutions for the future.

关键词： Rebar-free concrete construction (RFCC) Fiber -reinforced concrete (FRC) 3D concrete printing Bio-inspired structure

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The Supercritical N-Butanol Degradation Process for Recycling Photovoltaic Modules

SSRN

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SSRN 2024年

作者： Wang, xuwen Liu, Zhifeng Ruan, Haoda Li, Xinyu zhang, Lei School of Mechanical Engineering Hefei University of Technology Hefei230009 China Anhui Province Key Laboratory of Low Carbon Recycling Technology and Equipment for Mechanical and Electrical Products Hefei230009 China State Key Laboratory of Environmental Adaptability for lndustrial Products Guangzhou510300 China

The rapid advancement of the photovoltaic (PV) industry has elevated the recycling and reuse of decommissioned PV modules to critical challenges, essential for tackling environmental concerns and achieving resource reutilization. To facilitate the efficient degradation of PV modules and recycling of silicon materials, this study proposes a PV module degradation and recycling process based on supercritical n-butanol. The effects of various factors on the degradation rate of PV modules were systematically evaluated using single-factor studies to select an appropriate range of process parameters for optimization. Employing the response surface methodology (RSM) for the meticulous optimization of process parameters, the optimized parameters were as follows: n-butanol solvent volume of 470 ml, temperature of 328 °C for 83 minutes, resulting in a module degradation rate of up to 99 %. A second-order regression model was established to predict degradation efficiency. The high applicability of the fitted model was verified by comparing the actual degradation rates with the model's predicted values. Finally, the superiority of this recycling method was validated by characterizing the solar cells obtained through the supercritical method and comparing these characteristics with those of cells disassembled mechanically. © 2024, The Authors. All rights reserved.

关键词： Recycling

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Interfacial modification of recombinant protein for immunoglobulin G adsorption with spindle-shaped MOF as nano molecular containers

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TALANTA 2024年 280卷 126535页

作者： Wang, Kai zhang, Hongjin Jin, Nishan Zhou, Yutian Guo, Xinli Zhong, Wenbin Li, Xin Li, xuwen zhang, Yang Shenyang Med Coll Sch Pharm Shenyang Key Lab Med Mol Theranost Probes 146 Huanghe North Ave Shenyang 110034 Peoples R China Shenyang Med Coll Dept Sci & Technol 146 Huanghe North Ave Shenyang 110034 Peoples R China Shenyang Med Coll Sch Basic Med 146 Huanghe North Ave Shenyang 110034 Peoples R China Jilin Univ Coll Chem Dept Analyt Chem Changchun 130012 Peoples R China

Development of fresh solid phase extractant is critical for selective separation and purification of special proteins. Herein, we demonstrated a recombinant Staphylococcal Protein G (rSPG) with a His-tag modified the novel single-metal organic framework (rSPG@Ni-MOF-74). The proposed solid-phase extraction material possessed a uniform spindle-shaped structure, large surface area (709.60 m2 g-1) and pore volume (0.08 m3 g- 1), high metal content (22.57 wt%), which facilitated the interaction between host and guest. As results, the composite displayed outstanding selective recognition and adsorption of IgG, due to synergistic effect of the binding ability of rSPG with the Fc region of IgG, maintained through hydrogen bonding and electrostatic attraction, as well as hydrophobic interaction. The adsorption performance and mechanism of rSPG@Ni-MOF-74 have been fully investigated. Additionally, the rSPG@Ni-MOF-74 composite could effectively separate IgG from serum obtained from healthy humans, with the purity of the separated IgG verified through SDS-PAGE analysis. Furthermore, LCMS/MS analysis identified a high content of IgG (55.3 %) in the eluate from rSPG@Ni-MOF-74, suggesting the great potential of rSPG@Ni-MOF-74 in IgG separation and enrichment from complex matrix.

关键词： Metal-organic framework Immunoglobulin G Protein separation Purification

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Assessing vaccine effectiveness for varicella in Wuxi, China: a time-series analysis

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ANNALS OF MEDICINE 2023年第2期55卷 2246369页

作者： Wang, Lingling Yang, Xu Wang, xuwen Shi, Ping zhang, Xuhui Wuxi Ctr Dis Control & Prevent Wuxi Jiangsu Peoples R China Wuxi Ctr Dis Control & Prevent 499 Jin Cheng Rd Wuxi 214023 Jiangsu Peoples R China

Objective The varicella vaccine is not included in the national childhood immunization schedules in China. Varicella epidemics and outbreaks are frequently reported, and the evidence for the effectiveness of the varicella vaccine remains unclear. The aim of this study was to investigate varicella vaccine effectiveness in Wuxi, China. Methods Varicella surveillance data were extracted from the China Information System for Disease Control and Prevention, and vaccination data were obtained from the Vaccination Integrated Service Management Information System of Jiangsu Province, China. Time-series analysis approaches were used to estimate varicella vaccine effectiveness. Results A total of 16,093 varicella cases among children aged 1-6 years between January 2016 and December 2020 were analysed. A total of 217,297 children completed a two-dose varicella vaccination series. Compared with districts with lower vaccination rates, districts in Wuxi with higher varicella vaccination rates had a lower proportion of cases (p < 0.001). In the time-series approach, 0.8% fewer varicella cases were associated with a 1% increase in the two-dose varicella vaccination rate (p < 0.001), and similar effects were found in both the male and female populations. Conclusions Two-dose varicella vaccination was recommended as an effective health intervention to prevent varicella in Wuxi, China. Varicella vaccination is urgently needed in routine childhood immunisation programs. KEY MESSAGES The introduction of two-dose varicella vaccination was an effective intervention to prevent varicella in Wuxi, China. Varicella vaccination is urgently needed in routine childhood immunization programmes.

关键词： Varicella vaccination vaccine effectiveness

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Probing Hydrophobic Interactions between Polymer Surfaces and Air Bubbles or Oil Droplets: Effects of Molecular Weight and Surfactants

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LANGMUIR 2022年第17期38卷 5257-5268页

作者： Yang, Diling Xie, Lei Mao, Xiaohui Gong, Lu Peng, xuwen Peng, Qiongyao Wang, Tao Liu, Qi Zeng, Hongbo zhang, Hao Univ Alberta Dept Chem & Mat Engn Edmonton AB T6G 1H9 Canada

Hydrophobic interaction plays an important role innumerous interfacial phenomena and biophysical and industrial processes. In this work, polystyrene (PS) was used as a modelhydrophobic polymer for investigating its hydrophobic interactionwith highly deformable objects (i.e., air bubbles and oil droplets) inaqueous solutions. The effects of polymer molecular weight,solvent (i.e., addition of ethanol to water), the presence of surface-active species, and hydrodynamic conditions were investigated, viadirect surface force measurements using the bubble/drop probeatomic force microscopy (AFM) technique and theoreticalcalculations based on the Reynolds lubrication theory andaugmented Young-Laplace equation by including the effect ofdisjoining pressure. It was found that the PS of low molecularweight (i.e., PS590 and PS810) showed slightly weaker hydrophobic interactions with air bubbles or oil droplets, as compared toglassy PS of higher molecular weight (i.e., PS1110, PS2330, PS46300, and PS1M). The hydrophobic interaction between PS and airbubbles in a 1 M NaCl aqueous solution with 10 vol % ethanol was weaker than that in the bare aqueous solution. Such effects onthe hydrophobic interactions are possibly achieved by influencing the structuring/ordering of water molecules close to thehydrophobic polymer surfaces by tuning the surface chain mobility and surface roughness of polymers. It was found that the additionof three surface-active species, i.e., cetyltrimethylammonium chloride (CTAC), Pluronic F-127, and sodium dodecyl sulfate (SDS),to the aqueous media could suppress the attachment of the hydrophobic polymer and air bubbles or oil droplets, most likely causedby the additional steric repulsion due to the adsorbed surface-active species at the bubble/polymer/oil interfaces. Our results haveimproved the fundamental understanding of the interaction mechanisms between hydrophobic polymers and gas bubbles or oildroplets, with useful implications on developing effective me

关键词： Atmospheric chemistry Bubbles Liquids Molecular mechanics Solution chemistry

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Growth of Robust Carbon Nitride Films by Double Crystallization with Exceptionally Boosted Electrochemiluminescence for Visual DNA Detection

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ADVANCED OPTICAL MATERIALS 2023年第6期11卷

作者： Hou, Yuhua Fang, Yanfeng Zhou, Zhixin Hong, Qing Li, Wang Yang, Hong Wu, Kaiqing Xu, Yuan Cao, xuwen Han, Dan Liu, Songqin Shen, Yanfei zhang, Yuanjian Southeast Univ Sch Chem & Chem Engn Jiangsu Engn Lab Smart Carbon Rich Mat & Device Jiangsu Prov Hitech Key Lab Biomed ResState Key L Nanjing 211189 Peoples R China Southeast Univ Med Sch Nanjing 210009 Peoples R China

Electrochemically generated chemiluminescence (ECL) has attracted significant interest over the past decades, ranging from fundamental studies on highly efficient electron-to-photon interconversion to practical bioassays. Nonetheless, the ECL efficiency (phi(ECL)) of most emitters is low, which significantly hampers further development. Herein, this work reports a highly robust carbon nitride film with unusually enhanced ECL efficiency (2256 times higher than that of the reference Ru(bpy)(3)Cl-2/K2S2O8). Double crystallization, which provides the primary interaction of carbon nitride with the substrate and subsequent growth, plays a crucial role in the preparation. The improved ECL efficiency is ascribed to little pinholes suppressing futile co-reagent reduction, maintenance of more orbit-delocalized heptazine subunits improving ECL kinetics, and high transparency avoiding self-absorption. As a potential application, an ultrasensitive visual DNA biosensor by the naked eye is further successfully developed with a linear detection range of 100 pm to 1 mu m and limit of detection of 27 pm (S/N = 3).

关键词： biosensors carbon nitrides electrochemiluminescence energy conversion mechanical properties

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Engineered Bacterial Outer Membrane Vesicles-Based Doxorubicin and CD47-siRNA Co-Delivery Nanoplatform Overcomes Immune Resistance to Potentiate the Immunotherapy of Glioblastoma

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ADVANCED MATERIALS 2025年第15期37卷 e2418053页

作者： You, Haoyu zhang, Shilin zhang, Yiwen Chen, Qinjun Wu, Yuxing Zhou, Zheng Zhao, Zhenhao Su, Boyu Li, xuwen Guo, Yun Chen, Yun Tang, Weiyi Liu, Bing Fan, Hongrui Geng, Shuo Fang, Mingzhu Li, Fangxin Liu, Guangna Jiang, Chen Sun, Tao Fudan Univ Sch Pharm State Key Lab Med Neurobiol Minhang HospInnovat Ctr New Drug Dev Immune Infla Shanghai 201203 Peoples R China Fudan Univ MOE Frontiers Ctr Brain Sci Sch Pharm Dept Pharmaceut Shanghai 201203 Peoples R China Fujian Med Univ Affiliated Hosp 1 Natl Reg Med Ctr Dept Orthoped Binhai Campus Fuzhou 350212 Peoples R China Quzhou Fudan Inst Quzhou 324003 Peoples R China

Apart from the blood-brain barrier (BBB), the efficacy of immunotherapy for glioblastoma (GBM) is limited by the presence of intrinsic and adaptive immune resistance, implying that co-delivery of various immunotherapeutic agents or simultaneous regulation of different cells is urgently needed. Bacterial outer membrane vesicles (OMVs) offer a unique advantage in the treatment of GBM, owing to their multifunctional properties as carriers and immune adjuvants and their ability to cross the BBB. However, traditional OMVs can lead to toxic side effects and disruption of tight junctions in the BBB. Therefore, to enhance the in vivo safety and targeting capability of OMVs, we introduced engineered OMVs to reduce toxicity and further constructed a modularly assembled nanoplatform by performing simple peptide modifications. This nanoplatform demonstrates satisfactory biosafety and is able to continuously cross the BBB and target GBM with the assistance of Angiopep-2. Subsequently, immunogenic substances on OMVs, along with carried small-interfering RNA (siRNA) and doxorubicin, can promote and enhance the reprogramming and phagocytic abilities of macrophages and microglia, respectively, and increase the immunogenicity of GBM, ultimately overcoming GBM immune resistance to enhance the efficacy of immunotherapy. This OMVs-based nanoplatform provides a new paradigm and insights into the development of immunotherapy for GBM.

关键词： engineering technology glioblastoma immune resistance immunotherapy outer membrane vesicles

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UCNP@BSA@Ru nanoparticles with tumor-specific and NIR-triggered efficient PACT activity in vivo

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DALTON TRANSACTIONS 2021年第22期50卷 7715-7724页

作者： zhang, Chao Guo, Xusheng Da, xuwen Yao, Yishan Xiao, Haihua Wang, Xuesong Zhou, Qianxiong Chinese Acad Sci Tech Inst Phys & Chem Key Lab Photochem Convers & Optoelect Mat Beijing 100190 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China Beijing Inst Pharmacol & Toxicol Beijing 100850 Peoples R China Chinese Acad Sci Beijing Natl Lab Mol Sci Inst Chem State Key Lab Polymer Phys & Chem Beijing 100190 Peoples R China

Ru(ii)-based photoactivated chemotherapy (PACT) agents are promising;however, their short wavelength absorption (generally <550 nm) and poor tumor accumulation ability limit their in vivo applications. Herein, bovine serum albumin (BSA) coated lanthanide-doped upconversion nanoparticles (NaYF4:Yb:Tm@NaYF4 (UCNPs)) were loaded with a Ru(ii) PACT agent, i.e. [Ru(dip)(2)(spc)](+) (dip = 4,7-diphenyl-1,10-phenanthroline;spc = 2-sulfonic acid pyridine-3-carboxylic acid). The resultant UCNP@BSA@Ru can transfer [Ru(dip)(2)(spc)](+) to tumor cells in vitro as well as tumor tissues in vivo highly efficiently and selectively owing to the targeting ability of BSA and the enhanced permeability and retention effect of the nanoparticles. The subsequent near infrared (NIR) light irradiation at 980 nm or visible light irradiation at 470 nm can initiate dissociation of the spc ligand, and the released Ru(ii) aqua compounds ([Ru(dip)(2)(H2O)(2)](2+)) may exert a potent cytotoxicity towards a series of cancer cells but a much weaker effect on the normal IOSE80 cells. The in vivo (mouse) results showed that UCNP@BSA@Ru could inhibit tumor growth upon 980 nm irradiation more efficiently than in the dark and more efficiently than cisplatin (in the dark).

关键词： Tumors

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